α+β TYPE TITANIUM ALLOY HOT EXTRUSION SHAPE MATERIAL HAVING UNIFORM ACICULAR STRUCTURE AND EXCELLENT IN TENSILE PROPERTY

摘要

PROBLEM TO BE SOLVED: To provide a high strength α+β type titanium alloy hot extrusion shape material having a whole area acicular structure even when seeing any cross sections in whole range of extrusion longer direction.;SOLUTION: There is provided an α+β type titanium alloy hot extrusion shape material containing, by mass%, Al:2.5 to 6.8% and V:2.0 to 5.8% as well as C:0.08% or less, Fe:0.30% or less, N:0.05% or less, O:0.20% or less, H:0.015% or less and other elements of 0.10% or less and total of these elements of 0.40% or less and the balance Ti with inevitable impurities and having average of β particle diameter of 360 μm or less without cutting work and sectioning work, wherein any cross section structure in an extrusion longer direction is constituted by 100% acicular structure.;SELECTED DRAWING: Figure 7;COPYRIGHT: (C)2017,JPO&INPIT